Valve-gear for engines.



A. T. KELLER. VALVE GEAR. FOR ENGINES,

APPLICATION FILED AUG. 27, 1906.

Patented Apr. 6, 1909.

4 SHEETS-SHEET 1.

WITNESSES G INYENTOR THE noms PETEES C0,, WASHINGTON, a e:

A. T. KELLER.

VALVE GEAR FOR ENGINES.

APPLICATION FILED AUG. 27. 1906.

9 1 7,452. Patented Apr. 6, 1909.

4 SHEETSSHEET 2.

INVENTOR WITN ESSES 1m: mamas PETERS 0a., WASHINGTON, n. c.

A. T. KELLER.

VALVE GEAR. FOR ENGINES.

APPLIGATION FILED AUG.27,'1906.

Patented Apr. 6, 1909.

4 SHEETS-SHEET 3.

THE NORRIS PETERS cm, wAsHnycrclv, n. c.

A. T. KELLER. VALVE GEAR FOR ENGINE.

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ALBERT T. KELLER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TOMESTA MACHINE COMPANY, OI PITTSBURG, PENNSYLVANIA, A CORPORATION OFPENNSYL- VANIA.

VALVE-GEAR FOR ENGINES.

Specification of Letters Patent.

Application filed. August 27, 1906.

Patented April 6, 1909.

Serial No. 332,085.

To all whom it may concern:

Be it known that I, ALBERT T. KELLER, of Pittsburg, Allegheny county,Pennsylvania, have invented a new and useful Valve-Gear for Engines, ofwhich the following is a full, clear, and eXact description, referencebeing had to the accompanying drawings, forming part of thisspecification, in which E igure 1 is a sectional side elevation showingpart of an engine constructed in accordance with my invention; lfig. 2is a partial top plan view of the same; l: igs. 3 and 4 are enlargedsectional detail views of the pumping mechanism 5 is an enlarged endview of part of the lever mechanism shown in l ig. 1, hig. 6 is a sideview of the same; fig. 7 is a view similar to l ig. 6 but with he partsin another position; and 8 is an enlarged detail view, partly inhorizontal section, showing the slotted link and its connections.

My invention ralates to the controlling or governing of engines providedwith link mechanism and the object of the invention is to give aneconomical engine of this type wherein the operator may manually controlthe cut-oil according to the work done.

The invention rovides a variable speed mechanism for driving thegovernor of such an engine in connection with hand-controlled means fortemporarily changing the speed of the governor and thereby changing thespeed of the engine.

It also provides means whereby the engine may be controlled either bythe governor or by the engineer at will.

I-Ieretofore in this type of engine, the operator has manuallycontrolled. the point of cut-oil. by shifting the link usually connectedto a motive cylinder which accomplishes the link shifting. In myinvention, this link is connected to and operated by the governor, andthe governor is driven through a variable speed device having ahand-controlled changing device. The mechanism is, however, preferaliilyso arranged that the operator may also manually control the point ofcut-off in the usual way.

I11 the drawings, in which. I show my invention as applied to atwin-tandem compound engine, 2 represents the main crank shaft, and 3one of the low pressure cylinders, the engine being broken away along asub stantially central longitudinal line as well as intermediate of thelow pressure cylinder. A toothed wheel l on the main crank shaft isshown as driving a toothed wheel 5 on the main shaft 6 of a hydraulicpumping device. This pump is shown as provided with four cylinders 7 8,9 and 10, with the common plungers 11 and 12 for each pair, theseplungers being actuated by eccentric-rods 13 and 14 leading to eccentricstraps l5 and 16. The eccentric strap 15 surrounds an eccentric 17,which in turn surrounds two eccentric disks 18 placed at right angles toits plane and mounted on a shaft 19. Between these two eccentric disksis placed a pinion 20 engaging rack teeth 21 on a sliding rack 22. Theteeth 21 are on the upper face of the rack, which in another portionthereof is provided with side teeth 23 engaging another pinion indicatedat 24 on a shaft having two eccentric disks 25 located within theeccentric 26, which is shown in elevation and around which extends theeccentric strap 16.

In the form shown, 27 is the inlet pipe having the branch 28, while 29and 30 are the outlet pipes for the fluid being pumped. The rack 22extends centrally within the hollow shaft 6, and its projecting end isconnected by lever 31 to any suitable hand-operated link or lever. Bymanually shifting the rack 22 endwise, the position of the eccentricdisks 18 and 25 will be varied, thus correspondingly varying the strokeof the pumps. The liquid flows through pipe 30 from these pumps to thesupply ports of a hydraulic motor, indicated at 32, Fig. 1. I haveillustrated this hydraulic motor as consisting of three cylindersarranged radially around a crank shaft and having their pistonsconnected to cranks thereon. The crank shaft 33 of this motor has abeveled gear connection, indicated at 34, with a governor spindle 35.This governor, shown at 36, may be of any desirable type, such as theusual centrifugal weight type, it being driven through the spindle 35.

The engine is provided with a link reverse, and with any suitable meansfor shifting the link. In the form shown, the link 37 having theeccentric rod connections 38 and 39 is constructed according to thewellknown Allen'system. In the form shown, 40 is the sliding block, and50 is the steam cylinder whose piston rod 51 is connected to the pistonof a hydraulic cylinder 52, whose piston rod 53 is connected to the linkmechanism. The rods 5]. and 53 are part of the same piston rod which iscommon to the pistons of both cylinders. The liquid in cylinder 52 flowsback and forth around the piston, so that the cylinder acts as a checkdevice. The rod 53 is connected to cross-head 54 having a link 55connecting it to a lever 56 on the tumbling shaft 57. To this cross-headis also pivotally connected the link 58, whose other end is connected toa lever 59 il'ulcrumed at 60. The lever 59 is provided with a pivotedsleeve 61, through which loosely extends the end portion of a floatinglever 62 'l'ulcrumed at 63 on a rock lever 64 mounted on rock shaft 65,on the other end of which is a rock arm or lever 66. The upper end ofthis rock arm or lever is provided with a bearing pin 67 surrounded bybushing 68, (see Fig. 8) which engages a slotted link 69. At therespective end portions of this link are pins or studs 70 and 71, thepin 70 being connected by a rod 72 with a bell crank lever 73 which issuitably connected to that member of the governor which is raised andlower by its action. The pin 71 is connected by a link 74 and a rocker75 to an operating rod 76 which extends to the engineers stand orpulpit. Connected to the link 7 4 by means of a link 77 and a rocker 78are rods 79 and 80. The rod 79 runs to the engineers stand, and the rod80 is connected to a lever 81 on the stem by a by-pass valve 82 in apipe 83 which connects the pipes 27 and 30 of the pump before described.Connected to the floating lever 62 is a rod 85 which is connected to avalve rod 86 by means of a sliding or reciprocating connection 87. Thevalve rod 86 connects together the distributing valves in the chests 88and 89 of the cylinders 50 and 52, the pistons of which control thesetting of the link 37.

The pump described forms a means by which the speed of the engine may bechanged, the operator actuating the lever 31 to thereby shift theeccentrics 17 and 26 on the shaft 6. This changes the stroke of theplungers 11 and 12, thereby causing more or less liquid to be pumpedinto the motor 32 according as the stroke is lengthened or shortened.This changes the speed of said motor, and effects a corresponding changein'the speed of the governor spindle 35. This change in speed acts uponthe slotted link 69 through the bell crank 73 and the rod 62. vi ith theparts in the position shown in Fig. 6, the pin 71 at the lower end ofthe link 69 is in direct line with the rock shaft 65, and the lever 66and link 69 are caused to move in unison, the floating lever 62 beingmoved thereby through the rocker lever or arm 64. This moves theconnecting rod 85 and thereby changes the position of the distributingvalve in the cylinders 88 and 89 to thereby move the link 37. The

movement of the cross-head 54- actuates the lever 59 through theconnection 58 and returns the floating lever 62 to its originalposition, thereby closing the distributing valves and preventing furthermovement of the pistons in the cylinders 50 and 52.

The governor controls the engine in this manner in one direction only,which direction is predetermined by the arrangements of the connections,as the engine may be initially built to be governor controlled in eitherdirection.

When the engineer desires to control the engine independently of thegovernor and in both directions, he actuates the rod 79, thereby movingthe slotted link 69 into the position shonn in Fig. 7, and at the sametime, through the connection 80, opening the by-pass valve 82 betweenthe pipes 27 and 30. This permits a free circulation by the pumpindependently of the motor 32 and stops the governor. lVhen the link 69is thrown into the position shown in Fig. 7, the pin 71 at its lower endportion is throw into line "with the pin 67 of the rocker lever 66, sothat by actuating the rod 76 the arm 66 may be given any desiredmovement. This gives a corresponding movement to the floating lever 62,and through the connection 85 controls the position of the valves forthe cylinders 50 and 52 to regulate the position of the link 37.

By means of the by-pass valve 32, operated through the connection 80 inthe manner described, I enable the engine to be used in the ordinarymanner of thecommon rolling mill reversing engine.

i here reversing engines are used for rolling mill work, it is quitecommon for the mill to handle alternately short and long pieces, some ofthese pieces having greater draft than others. By the use of my improvedengine, the operator can speed up the engine where he is working upon along piece and thus roll the piece more rapidly; while \aith a shorterpiece of heavier draft, he can run the engine at a slower speed withsutlicient power to give the necessary draft. At the same time theengine may be put under governor control at any time; so that economy ofsteam is provided owing to automatic shifting of the cut-off accordingto load.

In rolling mill practice, reversing engines are often driven in onedirection for con siderable lengths of time. At other times they arereversed at rapid intervals. It will be obvious that with my improvedengine, economy of action is given in both such cases, whereas with theordinary reversing engine running in one direction, its operation iswasteful on the account of the manual shifting of the cut-off and thelack of governor control.

The engine may be provided with one or a number of cylinders, and may beeither sin gle or compound, and many changes may be made in the formand. arrangen'ient of the variable speed device and the connectionsbetween the governor and the link motion without departing from myinvention; since I consider myself the first to provide a reversingengine nith a governor and to employ a hand controlled device forchanging the speed of the engine.

I claim 1. In a reversing engine, the combination of a cut-ofimechanism, means for shifting said mechanism to control the operation ofthe engine, a governor for controlling said shifting means, a manuallyoperated means for controlling said shifting means, and means forplacing said shitting means under the exclusive control of either saidgovernor or said manually operated means; substan tially as described.

2. In a reversing engine, the combination of a cut-off mechanism, a linkmotion connected to the cut-off mechanism, a governor for shifting thelink motion, a manual controller for shifting the link motion, and meansfor placing said link motion under the exclusive control of either saidgovernor or said manual controller, said governor acting to control theengine only during its operation in one direct-ion; substantially asdescribed.

3. In a reversing engine, the combination of a cut-oil mechanism, a linkmotion connected to the cut-oil mechanism, a governor for shifting thelink motion, a manual controller for shifting the link motion, and meansfor rendering either of them efi ective to shift the link motion to theexclusion of the other, said governor acting to control the engine onlyduring its operation in one direction; substantially as described.

4. In a reversing engine, the combination ol a cut-oil mechanism, a linkmotion connected to the cut-off mechanism, a governor for shifting thelink motion, a manual controller for the link motion and manuallycontrolled means connected to the governor and to the manual controllerfor rendering either of them efi'ective to shift the link motion to theexclusion otthe other, said governor acting to control the engine onlyduring its operation in. one direction; substantially as described.

5. In a reversing engine, the combination of a cut-off mechanism, a linkmotion connected to the cut-oil mechanism, a governor for shifting thelink motion, a manual controller for controlling the link motion, andmanually controlled means connected to the governor and to the manualcontroller for rendering either of them effective to shift the linkmotion to the exclusion of the other, said governor acting to controlthe engine only during its operation in one direction,

and said manual controller acting to control the engine in eitherdirection; substantially as described.

6. In a reversing engine, the combination of a cut-off mechanism, a linkmotion connected to the cut-oil mechanism, motor and connection forshifting the link motion, a governor for controlling the motor, a manualcontroller for the motor, and means for rendering either of them efiective to control the motor to the exclusion of the other; substantiallyas described.

7. In a reversing engine, the combination of a cut-oil mechanism, a linkmotion connected to the cut-oil mechanism, a motor and connections forshifting the link motion, a governor to contro the motor, a manualcontroller for the motor, and manually operated controlling means forrendering either of them eilective to control the motor to the exclusionof the other, said governor acting to control the engine only during itsoperation in one direction; substantially as described 8. In a reversingengine, the combination of a cut-off mechanism, a link motion connectedto the cut-oi f mechanism, governor having variable speed device forshifting the link motion, a manual controller for shifting the linkmotion, and manually controlled means connected to the governor and tothe manual controller for rendering either of them effective to shiftthe link motion to the exclusion of the other, said governor acting tocontrol the engine during its operation in one direction substantiallyas described.

9. In a reversing engine, the combination of a cut-off mechanism, a linkmotion con-- nected to the cut-oil mechanism, a shifting device for thelink motion, a governor for controlling the shifting device, a manualcontroller for the shifting device, and manually controlled meansconnected to the governor and to the manual operated controller forrendering either of them effective for controlling the shifting deviceto the exclusion of the other; substantially as described.

10. In a reversing engine, the combination of a cut-oil mechanism, meansfor shifting said mechanism to control the operation of he engine, agovernor for controlling said shifting means, a manually operated meansfor controlling said shifting means, and a floating lever connected tothe governor and said manually operated means, and means to shift saidfloating lever to place said shifting means under the exclusive controlof either said governor or said manually operated means; substantiallyas described.

11. In a reversing engine, the combination of a cut-off mechanism, alink motion connected to the cut-off mechanism, a movable memberconnected to the link motion, a governor connected to the movablemember,

a manually operated means connected to the movable member, and means toshift said movable member for placing said link motion under theexclusive control of either said governor or said manually operatedmeans; substantially as described.

12. In a reversing engine, the combination of a out-oil mechanism, alink motion connected to the cut-off mechanism, a motive cylindershifting device for the link motion, a controlling valve for thecylinder shifting device, a floating lever connected to the controllingvalve, a governor connected to the floating lever, a manually operatedmeans connected to the floating lever, and means for shifting thefloating lever for placing said cylinder shifting device under theexclusive control of either said governor or said manually operatedmeans; substantially as described.

13. In a reversing engine, a governor, a motor for the governor, a pumpdriven by the engine for actuating the motor, and means for varying theaction of the pump; substantially as described.

14. In a reversing engine, a governor, a motor for driving the governor,a pump operated by the engine for supplying the motor, and means forchanging the stroke of the pump; substantially as described.

15. In a reversing engine, a governor, a motor for drivmg the governor,a pump for supplying fluid to the motor, means for varying the action ofthe pump, and means for rendering the motor inoperative; sub stantiallyas described.

16. In a reversing engine, the combination of a cut-off mechanism, alink motion connected to the cut-oil mechanism, a motive cylindershifting device connected to the link motion, a governor connected tothe motive cylinder shifting device, a manually operated controllingmeans connected to the motive cylinder shifting device, means forplacing the motive cylinder shifting device under the exclusive controlof either said governor or said manually operated means, a motor fordriving the governor, and connections between the motor drivingmechanism and the governor shifting means for rendering said motorinoperative when the governor is disconnected; substantially asdescribed.

In testimony whereof, I have hereunto set my hand.

ALBERT T. KELLER.

Witnesses GEO. B. BLEMING, JOHN MILLER.

